20080868 Ver 2_I-22 2015 Porter Sweep Downstream Biotic Index Table_20160708

Table 1-22. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Porter Creek downstream station
in Mav of 2015.
Species/taxon'
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value n
Product of
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. w/o hair
5
1.0
3
3.0
Tubificoides heterochaetus
6
1.1
3
3.3
Polychaeta
Amphicteis floridus
39
2.0
30
60.0
Laeonereis culveri
1
1.0
1
1.0
Polydora cornuta
1
1.2
1
1.2
Arthropoda
Insecta
Diptera
Chironomus decorus
16
1.0
10
10.0
Cryptochironomus sp.
1
1.0
1
1.0
Dicrotendipes nervosus
20
1.0
10
10.0
Goeldichironomus devineyae
19
2.0
10
20.0
Parachironomus sp.
4
1.1
3
3.3
Tanytarsus sp.
19
2.3
10
23.0
Hemiptera
Abedus/Belostoma sp.
2
1.0
1
1.0
Corixidae sp.
1
1.3
1
1.3
Malacostraca
Amphipoda
Apocorophium lacustre
11
2.2
10
22.0
Apocorophium louisianum
6
2.2
3
6.6
Apocorophium sp.
37
2.2
30
66.0
Gammarus mucronatus
1
2.3
1
2.3
Gammarus tigrinus
300
2.0
100
200.0
Leptocheirus plumulosus
1
3.0
1
3.0
Decapoda
Pa/aemonetes pugio
78
2.5
30
75.0
Rhithropanopeus harrisii
15
2.5
10
25.0
Isopoda
Cassidinidea lunifrons
8
2.0
3
6.0
Cyathura polita
18
2.0
10
20.0
Edotia montosa
13
2.6
10
26.0
Mysida
Americamysis almyra
171
2.2
100
220.0
Tanaidacea
Hargeria rapax
68
1.6
30
48.0
Mollusca
Bivalvia
Macoma tenta
1
2.0
1
2.0
Gastropoda
Littoridinops sp.
153
2.0
100
200.0
Total
I
1
523
1,060.0
Estuarine Biotic Index = 2.03
Total taxa = 32
Total taxa with sensitivitv values = 26
'Only those taxa for which a sensitivity value is available are displayed
bTotal number of individuals caught in all three sweep replicates.
`Sensitivity values provided by NCDWR.
1-28